@charset "utf-8";
/* CSS Document */

.box{
	width:680px;
	margin: 40px auto; 
	display:flex;
	flex-wrap:wrap;
}

.winter{
	background-image:url("images/winter.jpg");
}

.summer{
	background-image:url("images/summer.jpg");
}

.fall{
	background-image:url("images/fall.jpg");
}

.spring{
	background-image:url("images/spring.jpg");
}

.season-box{
	width:330px;
	height:214px;
	border-radius:5px;
	display:block;
	margin:5px;
	background-size:100%;
	background-repeat:no-repeat;
	opacity:.5;
	transition:opacity 2s;
}

.season-box:hover{
	opacity:1.0;
}